3v4l.org

run code in 300+ PHP versions simultaneously
<?php $values = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4); $sum = 0; foreach ($values as &$value) $value++; unset($value); foreach ($values as $value) $sum += $value; print_r($values);
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [a] => 2 [b] => 3 [c] => 4 [d] => 5 )
preferences:
80.69 ms | 407 KiB | 5 Q